/*
 * **** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * J4Care.
 * Portions created by the Initial Developer are Copyright (C) 2015-2018
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * **** END LICENSE BLOCK *****
 *
 */

package org.dcm4che3.opencv;

import java.io.ByteArrayInputStream;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;

import javax.imageio.stream.MemoryCacheImageInputStream;

import org.dcm4che3.imageio.codec.ImageDescriptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Nicolas Roduit
 * @since Mar 2018
 */
class MemoryStreamSegment extends StreamSegment {
    private static final Logger LOGGER = LoggerFactory.getLogger(MemoryStreamSegment.class);

    private final ByteBuffer cache;

    MemoryStreamSegment(ByteBuffer b, ImageDescriptor imageDescriptor) {
        super(new long[] { 0 }, new long[] { b.limit() }, imageDescriptor);
        this.cache = b;
    }

    public ByteBuffer getCache() {
        return cache;
    }

    public static ByteArrayInputStream getByteArrayInputStream(MemoryCacheImageInputStream inputStream) {
        if (inputStream != null) {
            try {
                Field fid = MemoryCacheImageInputStream.class.getDeclaredField("stream");
                if (fid != null) {
                    fid.setAccessible(true);
                    return (ByteArrayInputStream) fid.get(inputStream);
                }
            } catch (Exception e) {
                LOGGER.error("Cannot get inputstream", e);
            }
        }
        return null;
    }
}
